* sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_start): Take into
acount that elf/rtld's main program might remove some varibales
from the environment if we're trying to be secure. Move the Hurd
startup data if necessary, or, if we there is no startup data,
make sure the magical convention that ARGV[0] is stored just after
the environment list.